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Wisconsin Heritage Online Digital Imaging Guidelines Version 2.0 September 2009

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Wisconsin Heritage Online Digital Imaging Guidelines Version 2.0 September 2009 Wisconsin Heritage Online Digital Imaging Guidelines Version 2.0 September 2009 Version 1.0 developed by the Wisconsin Heritage Online Digital Imaging Working Group, August 17, 2006 ""%%&'(&)'*)%*),& INTRODUCTION6666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666"# Purpose,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1! Scope ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1! General Principles ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1! PLANNING 666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666$# Assessment of the Source Collection,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,2! Original versus Intermediate ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,2! File Naming Conventions,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,2! Archival Storage of Digital Masters ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,3! HARDWARE 666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666%# Computers,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,4! Monitors ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,4! Scanning Equipment,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,5! Technical Factors ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,5! IMAGE CAPTURE GUIDELINES 666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666 98# Photoshop Configurations ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,/.! Scanner Configuration,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,//! SCANNING GUIDELINES 66666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666 &$# Minimum Specifications and Resolution Chart ,,,,,,,,,,,,,,,,,,,,,,(44347# 330./40#031#23.50326! Scanning modes ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,/3! GUIDELINES FOR CREATING DIGITAL MASTER FILES66666666666666666666666666666666666666666666 &6# Minimum Requirements ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,/5! File Formats ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,/6! IMAGE ENHANCEMENT PROCESSES 666666666666666666666666666666666666666666666666666666666666666666666666666666666 :8# Introduction ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,0.! Minimum Enhancements ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,0.! Optional Enhancements,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,0/! CREATING ACCESS FILES FOR WEB DELIVERY 6666666666666666666666666666666666666666666666666666666666 7$# Access Files Chart,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,02! Watermarking ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,02! 89:((<'*#:"#)('A( 6666666666666666666666666666666666666666666666666666666666666666666 ,,-,./0--123,1/4-5/6789476,# Page 2 of 25 INTRODUCTION Purpose The purpose of this document is to assist Wisconsin Heritage Online Content Contributors in the creation of digital representations of their collections. This guide was prepared in light of general principles specified in A Framework of Guidance for Building Good Digital Collections (http://www.framework.niso.org). The document provides a set of scanning and image processing guidelines for digitization projects that can be undertaken in-house by participating organizations. These guidelines are not intended to be used as the standard for digital imaging, but rather as a set of flexible recommendations for image capture, enhancement, presentation, and storage. As indicated in A Framework of Guidance for Building Good Digital Collections (http://www.framework.niso.org), there are no absolute rules for creating good digital collections. Inherent or unique characteristics of source materials often require different approaches to the digitization process and should be considered on a case-by-case basis. Scope This document focuses on tasks and specifications necessary to produce digital images for immediate use and high quality archiving. It provides recommendations for digitizing two- dimensional non-digital formats, such as handwritten manuscripts, typescript works on paper, bound volumes, photographic prints, slides, glass plate or film negatives. This document does not provide guidelines for audio, video, or three-dimensional artifacts at this time. Original source collections differ widely in their types of material, audience, and institutional purpose; therefore, specific practices may vary from institution to institution as well as for different collections within a single institution. General Principles A reminder: If you encounter unfamiliar terms in this document you may consult the Glossary. Image capture and delivery capabilities are changing very rapidly. This document includes guidelines that we think are fairly universal and assume an approach that is not dependent on use. We will use the phrase “use-neutral” in this document.These guidelines are based on the following general principles: • To create digital objects that are accessible and interoperable across platforms and devices • To ensure a consistent, high level of image quality across collections and institutions • To create digital objects that support both intended current uses and potential future uses by: o Building a repository of digital master files to facilitate reprocessing and the maintenance of digital collections over time o Providing derivative access files for current use Page 3 of 25 The use-neutral approach to digitization ensures support for both current and future use. It implies that an image is digitized once and at the highest level of quality affordable to meet the needs of a variety of future uses. The goal of this approach is to create high-quality digital master files and avoid rescanning in the future. For more information on the use-neutral approach see Colet’s “Planning an Imaging Project” (http://www.diglib.org/pubs/dlf091/dlf091.htm#visguide1) in Guides to Quality in Visual Resource Imaging. The use-neutral approach includes the notion of digital master files and derivatives. Digital Masters Digital master files are created as a direct result of the image capture process either through scanning or photographing with a digital camera. The digital master files should represent as accurately as possible the visual information of the original material. General recommendations for digital master file creation include: • Scanning at the highest quality affordable • Lossless compression • Non-proprietary formats, such as TIFF or JPEG2000 Because the process of creating digital masters usually results in large file sizes, digital masters are not used for online display. Their primary function is to serve as a long-term archival file and a source for derivative files. Digital masters, also referred to as archival master files, are stored in a digital repository that requires a long-term preservation policy and a strategy for identification, storage, backup, and migration to new media. Digital masters are NOT intended to serve as preservation files to replace original objects. Although digitization can reduce handling of original items, it is not considered a preservation strategy. Derivative Images Derivative files are created from digital master files for specific uses including access to images for online delivery and creation of high-quality prints. Lossy compression techniques, such as JPEG, can be applied to derivative files to reduce file size. Derivative files serve specific, immediate use and must not be used for archiving purposes. Page 4 of 25 PLANNING Several issues need to be addressed in the planning phase to ensure the
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